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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Major components of net realized capital gains (losses) on investments |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 13.1 | $ 51.4 | $ 41.5
Fixed maturities, available-for-sale: Gross losses |  | (61.0) | (141.7) | (191.5)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (21.7) | (26.2) | (8.9)
Fixed maturities, available-for-sale: Hedging, net |  | (11.5) | 2.2 | (0.7)
Fixed maturities, trading |  | 1.6 | (8.6) | (13.4)
Equity securities |  | 128.4 | 64.0 | (171.9)
Mortgage loans gains (losses) |  | (101.3) | (134.5) | (74.6)
Derivative net realized capital gains (losses) |  | 14.9 | (34.1) | 237.0
Other gains (losses) |  | 10.2 | 155.3 | 0.4
Net realized capital gains (losses) | [1] | (27.3) | (72.2) | (182.1)
Unrealized gains (losses) on fixed maturities, trading |  | 0.7 | (9.6) | (3.2)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | 2.0 | 6.8 | (1.4)
Unrealized gains (losses) on fixed maturities, trading still held at reported in market risk benefit remeasurement (gain) loss |  | 1.7 | 2.9 | (16.6)
Unrealized gains (losses) on equity securities |  | 106.9 | 73.4 | (117.1)
Unrealized gains (losses) on equity securities reported in net investment income |  | 37.9 | 34.7 | (0.7)
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 0.0 | 1.7 | (1.7)
Proceeds from sales of investments |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 3,346.4 | $ 5,392.7 | $ 13,647.0
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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